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2301.

Question : Offsprings formed by organisms showing asexual reproduction have greater range of similarity because ……………….... (1) only one parent is involved in asexual reproduction. (2) reproductive cells does not involve in asexual reproduction. (3) asexual reproduction is faster than sexual reproduction. (4) more offsprings are produced in asexual reproduction.a.(1) and (2)b.(1) and (3)c.(2) and ( 4)d.(3) and (4)

Answer»

(1) and (2)
(1) and (3)
(2) and ( 4)
(3) and (4)

ANSWER :A::C::D
Discussion
2302.

Question : Offspring formed by asexual method of reproduction have greater similarity among themselves because (i) asexual reproduction does not involve fusion of gametes. (ii) asexual reproduction involves only one parent. (iii) asexual reproduction occurs before sexual reproduction. (iv) asexual reproduction occurs after sexual reproduction

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(i) and (ii)
(i) and (III)
(ii) and (IV)
(iii) and (iv)

Solution :INDIVIDUALS FORMED by asexual REPRODUCTION have the same genetic make up as that of parent.
Discussion
2303.

Question : Offspring formed as a result of sexual reproduction exhibit more variations because

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genetic material comes from many PARENTS.
sexual REPRODUCTION is a LENGTHY PROCESS
genetic material comes from two parents of different SPECIES.
genetic material comes from two parents of same species.

Solution :Two parents of same species are involved in sexual reproduction.
Discussion
2304.

Question : Of the following, which sequence is present in Rous Sarcoma Virus?

Answer»

DNA RARR RNA -»PROTEINS
DNA rarr DNA rarr proteins
RNA rarr DNA —» proteins
RNA rarr DNA rarr RNA rarr proteins

Answer :D
Discussion
2305.

Question : Of the following, what do mitochondria and chloroplast have in common

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DNA is present
ATP is PRODUCED
RIBOSOMES are present
all of the above

SOLUTION :N/A
Discussion
2306.

Question : Of the following anatomical structures, which is homologous to the wing of a bat?

Answer»

the ARM of a human
the WING of a butterfly
the TAIL of a fish
the DORSAL FIN of a shark

Answer :A
Discussion
2307.

Question : Of all the species of insects known, nearly 70-80 per cent are found in

Answer»

TROPICAL RAIN FORESTS
tropical savannah
chaparral
deciduous forests

Answer :A
Discussion
2308.

Question : Octopus, cockroach and frog all have eyes. Can we group these animals together to establish a common evolutionary origin. Justify your answer.

Answer»

SOLUTION :CONVERGENT EVOLUTION is the process, by which indepenently evolved features, amy similar to each other, but can arise through different developmental pathways. So the octopus, cockroach and frog all have eyes. The independently evolved eye may similar in each other, but can arise THOUGH different developmental pathways.
Discussion
2309.

Question : Octopus belongs to class

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mollusca
pelecypoda 
arthropoda
cephalopoda 

ANSWER :D
Discussion
2310.

Question : Occurrence of Zoochlorellae in the body wall of Hydra is an example of

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a PREDATION
a food CHAIN involving a parasite
commensalism
MUTUALISM

ANSWER :D
Discussion
2311.

Question : Observe the table which shows contrast forms of pea plants: {:("Colour of the seed","Position of the flower"),("Green (G)","Axial (A)"),("Yellow(g)","Terminal (a)"):} The genetic makeup with green seed and terminal flower is indicated as

Answer»

gGAa
GgAa
GgAA
Ggaa

Answer :D
Discussion
2312.

Question : Observe the picture carefully and answer the following questions: ( 1 ) State the category according to the food eaten by encircled organisms. ( 2 ) State the trophic level observed in the picture. ( 3 ) State two abiotic components of an environment. ( 4 ) Which is an important process of an ecosystem observed in a picture?

Answer»

SOLUTION :( 1 ) SQUIRREL and DEER are both herbivores.
( 2 ) Producer (Trophic LEVEL- I) and herbivores (Trophic level-II)
( 3 ) SOIL, light
( 4 ) Flow of energy
Discussion
2313.

Question : Observe the picture and answer the following questions : Name the part indicated as (i)

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ANSWER :AXON
Discussion
2314.

Question : Observe the illustration and answer the questions. Identify the alleles in the first generation plant related to the trait, tallness.

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ANSWER :T,t
Discussion
2315.

Question : Observe the illustration and answer the questions. Identify the part labelled as (i)

Answer»


ANSWER :CENTRAL CANAL.
Discussion
2316.

Question : Observe the following part of a flowering plant. Prepare a note.

Answer»

Solution :The given diagram is the structure of ovule which is present in the ovary (Carpel) of plant.
(1) An ovule is an egg shoped structure attached by a stalk (female) to the inner side of the overy.
(2) Pollen grains reach stigma and travel through style. Pollen grains produce pollen tubes which contain two nuclei, They reach the ovule for fertilization.
(3) At the center of each ovule there is a microscopic embryo sac filled with food water.
(4) The embryo sac is composed of gametophyte cells.
(5) The majority of flowering plantshave an embryo sac consisting of seven cells and eight nuclei.
(6) They are one egg (female gamete), two SYNERGIDS, one central cell (secondary nucleus) and three ANTIPODALS.
(7) Central cell contains two nuclei, they are called polar nuclei.
Discussion
2317.

Question : Observe the following graph and answer the questions given below . What are the consequences of oxygen deficit ?

Answer»

SOLUTION :75 MINUTES
Discussion
2318.

Question : Observe the following diagram and write a note on light dependent, light indepen- dent reactions.

Answer»

SOLUTION :Note on light dependent reactions :
1) Light dependent reactions are also called as photochemical phase which takes placein grana of chloroplast.
2) Several steps occur in the light dependent reaction.
3) Step. I : The chlorophyll on exposure to light energy becomes activated by absorbingphotons.
4) Step. II : The energy is USED in splitting the water molecule into two component ions NAMED hydrogen `(H^+)`, hydroxylion `(OH^(-))`. This reaction is known as photolysis.
5) Step - III : `OH^(-)` ions through a SERIES of steps produce water `(H_2O)` and `O_2`.
6) The end products of light reaction are ATP, NADPH'and `O_2`
Note on dark reaction . or light independent reaction:
1 ) In light independent phase the hydrogen of theNADPH is used to combine it with `CO_2` by utilizingATP energy and to produce glucose.
2 ) After several reactions , finally glucose is convertedto starch .
3) All these reactions occur in the stroma region of the chloroplast .
4) This process is known as calvin cycle.
Discussion
2319.

Question : Observe the following chemical reactions i) Fe_2O_3 + 2Alto 2Fe + Al_2O_3 ii) ZnO + C to Zn + CO iii) Fe_2O_3 + 3C to 2Fe + CO iv) Al_2O_3 + 3C to 2Al + 3CO Which of the above reaction is wrong? How is the metal present in the wrong equation extracted? Which of the above reaction can be used to join the broken parts of the machines. Why?

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SOLUTION :WRONG reaction is (iv) It is extracted by electrolysis (i) is used to join broken parts
`because`It is exothermic. FE is in liquid state.
Discussion
2320.

Question : Observe the following chemical equations andidentify the correct statement. (i) CuSO_(4) + Fe rarr FeSO_(4) + Cu (ii) 2AgNO_(3) + Cu rarr Cu(NO_(3))_(2) + 2Ag

Answer»

COPPER is more REACTIVE than IRON and SILVER
Iron is LESS reactive than Copper and Silver
Copper is more reactive than Silver but less reactive than Iron
Silver is more reactive than Copper and Iron

Solution :Copper is more reactive than Silver but less reactive than Iron
Discussion
2321.

Question : Observe the figure and answer the questions. Identify the parts indicated as (i) and (ii)

Answer»


ANSWER :i)VESTIBULAR NERVE II) AUDITORY Nerve
Discussion
2322.

Question : Observe the environment around you. Complete the following flow chart.

Answer»

SOLUTION :
Discussion
2323.

Question : Observe the diagram given right and answer thequestions : Label the parts A, B, C & D.

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Solution :A : CEREBRUM
C : CEREBELLUM
B : CORPUS callosum
D : Medulla OBLONGATA
Discussion
2324.

Question : Observe the diagram given right and answer thequestions : Give the function of C and D.

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SOLUTION : C : BALANCING of BODY and maintain posture
D : Vomiting , COUGHING, breathing, salivation or any other correct answer(anyone).
Discussion
2325.

Question : Observe the diagram given right and answer thequestions : Name the layers which wrap this organ.

Answer»

SOLUTION : PIA MATER, ARACHNOID and DURA mater.
Discussion
2326.

Question : Observe the diagram and answer the questions: Which part give rise to shoot when seed germinates ?

Answer»


ANSWER :PLUMULE
Discussion
2327.

Question : Observe the diagram and answer the questions: Is the seed dicot or monocot ?

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ANSWER :DICOT
Discussion
2328.

Question : Observe the diagram and answer the questions: Identify 'a' in the diagram.

Answer»


ANSWER :a-Radicle
Discussion
2329.

Question : Observe the figure and answer the following questions. (i) Label (A) to (D) (ii) What process is shown in the diagram ? (iii) Explain the process

Answer»

SOLUTION :
Discussion
2330.

Question : Observe figs. (a), (b), (c) and (d). rarr Determine on the basis of your observations whether the movement occurring in the plant is growth based or not? rarr State the type of movement occurred herein.

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SOLUTION :In figures (a), (b), and (C) the MOVEMENTS are GROWTH related and in FIG. (d) the movement is not related to growth.
Discussion
2331.

Question : Obesity is characterized by tumour formation

Answer»


SOLUTION :Correct Statement: OBESITY is CHARACTERIZED by an accumulation of excess body fat with an ABNORMAL increase in body weight.
Discussion
2332.

Question : Nutritionally Hydra is

Answer»

saprophytic
insectivorous
herbivorous
carnivorous 

ANSWER :D
Discussion
2333.

Question : Number of which consumers will decline and which will increase?

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Solution :PRIMARY CONSUMERS (Grasshopper) will INCREASE and TERTIARY consumers (snake) will decline.
Discussion
2334.

Question : Number of testicular lobules in testes is

Answer»

250
500
750
200-300

Answer :A
Discussion
2335.

Question : Number of teeth, which are replaced in man

Answer»

20
28
32
12 

ANSWER :A
Discussion
2336.

Question : Number of spermatozoa, a single primary spermatocyte ultimately produces in spermatogenesis, is

Answer»

ONE
two
four
eight

Answer :A::C
Discussion
2337.

Question : Number of RBC in an adult man per mm of blood is

Answer»

5,000
50,000
500,000
5,000,000 

ANSWER :D
Discussion
2338.

Question : Number of RBC increases if one lives at higher altitude because

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there is LESS oxygen on mountains
more HEAT is required in BODY for producing body warmth
there are no germs in mountain air
there is more oxygen on mountains 

ANSWER :A
Discussion
2339.

Question : Number of floating ribs human body is

Answer»

5 pairs
3 pairs
2 pairs
6 paris

Answer :C
Discussion
2340.

Question : Number of cranial nerves in man are

Answer»

12
10
8
24

Answer :A
Discussion
2341.

Question : Number of cranial nerves in frog are

Answer»

12
10
8
24

Answer :B
Discussion
2342.

Question : Number of cervical vertebrae in camel

Answer»

same as that of whale
moreas that of horse
less than of rabbit
more than of rabbit

Answer :A
Discussion
2343.

Question : Nucleosome is made of

Answer»

only DNA
the HISTONES with DNA WRAPPED AROUND them
histones
DNA and RNA

Solution :N/A
Discussion
2344.

Question : Nucleic acids are not found in,

Answer»

MITOCHONDRIA
Peroxisomes
Chloroplasts
Ribosomes

Answer :B
Discussion
2345.

Question : Nuclear fusion reactions are the source of energy in the sun and other stars.

Answer»


ANSWER :1
Discussion
2346.

Question : Nuclear energy is a renewable energy.

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Solution :CORRECT statement: The nuclear energy is a non-renewable energy SOURCE. The material USED in nuclear plants is not renewable.
Discussion
2347.

Question : Now a day, we are observing the environmental degradation everywhere. Complete the flow chart given besides with the help of environment.

Answer»

SOLUTION :
Discussion
2348.

Question : Note down the secondary sexual changes that occur in girls and boy's during the puberty.

Answer»

Solution :The age at which the reproductive organs become functional and the boys and GIRLS become sexually mature is know as .puberty.. The rate of general body growth begins to slow down, reproductive tissues begin to mature. This period during adolescence is called puberty.
Common changes occur during puberty: Following changes are common in boys and girls :
Thick hairs growing in armpits and the genital area between the thighs, thinner hair can also APPEAR on legs and arms, as well as on face, increase in the height and weight, some times skin becomes oily and pimples MAY develop, etc.
Secondary sexual changes : In girls, ovary starts SECRETING female SEX hormones.
`rarr` Ovaries start producing ova.
`rarr` Development of reproductive organs and breasts develop, with darkening of the skin of the nipples.
`rarr` Menstrual cycle starts.
`rarr` In Boys, testes start secreting male sex hormones.
`rarr` Testes start producing sperms. Many other changes take place during puberty.
New hair growth.
`rarr` Body becomes more muscular.
`rarr` The voice begin to crack.
`rarr` Shoulders and chest broaden.
The penis occasionaly begins to become enlarged and erect.
Discussion
2349.

Question :not Only the food of plants but also their wastes are useful to us. What evidences do you give for it?

Answer»

Solution :1) The secondary metabolites are the materials which do not require for normal growth and developments.
2) Examples for the secondary metabolites are alkaloids, Tannins , Resins , Gums and Latex.
3) Alkaloids are nitrogenous by - products and poisonous. They are stored in differ- ent parts of the plant.
4) The alkaloids secreted by plants and their uses are :
a) Quinine is used as antimalarial drug.
b) Nicotine is used as insecticide.
c) Morphine and COCAINE are used as pain killers.
d) Reserpine is used as medicine for snake bite.
e) Caffeine is used as stimulant for central nervous system.
f) Nimbin is used as antiseptic.
g) Scopolamine is used as sedative.
5) Tannins are carbon compounds which are deep brown in colour. Tannins are used in tanning of leather and in medicines. e.g. : Cassia , Acacia.
6) Resins occur mostly in Gymnosperms in specialized passages called resin pas-sages. They are used in varnishes. e.g. : Pinus.
7) When branches of trees are cut a sticky substance called gum is secreted. The gum SWELLS by absorbing water and helps in the healing of damaged parts of a plant. e.g. : Neem, Acacia.
8) Economically gums are valuable , being used as adhesives and binding agents in thepreparation of the medicines, food etc.
9) Latex is a sticky, white substance secreted by paints. Latex is stored in latex CELLS or latex vessels.
10) From the latex of Heavea braziliensis (RUBBER plant) rubber is prepared. Latex from Jatropa is the source of bio-diesel.
Discussion
2350.

Question : Nostoc and Anabaena can fix atmospheric nitrogen in specialized cells known as

Answer»

Conidiophores
Auxospores
Hormogones
Heterocysts

Answer :D
Discussion